Difference between revisions of "M105 Address Selector"
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The '''M105 Address Selector''' is a [[Digital Equipment Corporation|DEC]] [[FLIP CHIP]] which implements the '[[address]] selection' function (i.e. detecting when a particular [[bus]] cycle is destined for a particular [[peripheral|device]]) for the [[UNIBUS]]. | The '''M105 Address Selector''' is a [[Digital Equipment Corporation|DEC]] [[FLIP CHIP]] which implements the '[[address]] selection' function (i.e. detecting when a particular [[bus]] cycle is destined for a particular [[peripheral|device]]) for the [[UNIBUS]]. | ||
| − | It was used, along with an [[M782 Interrupt Control]], in early [[PDP-11]] [[device controller]]s which plugged into an [[Small Peripheral Controller|SPC]] slot. It was also used in a number of early devices which were built out of a custom [[backplane]] and a large number of FLIP CHIPs, such as the [[RK11|RK11-C]]. Some later devices which no longer used a large number of small Flip Chips (such as the [[TM11|TMB11]]) also used it. | + | It was used, along with an [[M782 Interrupt Control]], in early [[PDP-11]] [[device controller]]s which plugged into an [[Small Peripheral Controller|SPC]] slot. It was also used in a number of early devices which were built out of a custom [[backplane]] and a large number of FLIP CHIPs, such as the [[RK11-C disk controller|RK11-C]]. Some later devices which no longer used a large number of small Flip Chips (such as the [[TM11 magtape controller|TMB11]]) also used it. |
| − | The board contained a number of [[jumper]]s which could be use to set the address to be recognized; the jumpers apply to UNIBUS address [[bit]]s 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 [[word]] | + | The board contained a number of [[jumper]]s which could be use to set the address to be recognized; the jumpers apply to UNIBUS address [[bit]]s 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 [[word]] [[register]]s, the M105 cannot accomplish that. |
| − | {{stub}} | + | {{semi-stub}} |
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| + | ==External links== | ||
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| + | * [http://www.bitsavers.org/pdf/dec/pdp11/handbooks/PDP11_PeripheralsHbk_1972.pdf pdp11 peripherals and interfacing handbook (1972 edition)] - the M105 is covered on pp. 213-215 (pp. 223-225 of the PDF) | ||
| + | * [http://so-much-stuff.com/pdp8/flipchip/modules.htm FlipChip Modules] - Images and engineering drawings for FLIP CHIP modules | ||
| + | ** [http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/Mxxx/M105/ M105] | ||
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| + | [[Category: UNIBUS]] | ||
| + | [[Category: DEC Boards]] | ||
Latest revision as of 03:13, 28 November 2023
The M105 Address Selector is a DEC FLIP CHIP which implements the 'address selection' function (i.e. detecting when a particular bus cycle is destined for a particular device) for the UNIBUS.
It was used, along with an M782 Interrupt Control, in early PDP-11 device controllers which plugged into an SPC slot. It was also used in a number of early devices which were built out of a custom backplane and a large number of FLIP CHIPs, such as the RK11-C. Some later devices which no longer used a large number of small Flip Chips (such as the TMB11) also used it.
The board contained a number of jumpers which could be use to set the address to be recognized; the jumpers apply to UNIBUS address bits 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 word registers, the M105 cannot accomplish that.
External links
- pdp11 peripherals and interfacing handbook (1972 edition) - the M105 is covered on pp. 213-215 (pp. 223-225 of the PDF)
- FlipChip Modules - Images and engineering drawings for FLIP CHIP modules
